An electronic device may include: a processor; a frame comprising metal including a first conductive part and a second conductive part; a first wireless communication circuit for providing a first signal of a first frequency band to the first conductive part; a second wireless communication circuit for providing a second signal of a second frequency band to the second conductive part; a passive element electrically connected to the path between the second conductive part and the second wireless communication circuit; and a switching circuit connected to the passive element, wherein the first wireless communication circuit can be controlled to transmit the first signal through the first conductive part, and the switching circuit can be controlled such that a first switch connected to the passive element operates in an open state while the first signal is transmitted. The passive element and the switching circuit in the open state can block passage of at least a part of the first signal introduced to the second conductive part.

A method for active circuit antenna optimization includes recording a capacitance value at each frequency of a frequency range using one or more tuning capacitors, thereby generating a capacitor value frequency range. The method further includes creating one or more non-linear circuit designs in an RF circuit simulator. The one or more non-linear circuit designs match the capacitance value at each frequency of the frequency range recorded from the one or more tuning capacitors. The method then includes creating one or more non-linear circuits from the non-linear circuit design. Each tuning capacitor has a corresponding non-linear circuit where all the one or more non-linear circuits match the capacitor value frequency range of the one or more tuning capacitors.

A compact mobile high-frequency Antenna that quickly and quietly self-adjusts to minimize Voltage Standing Wave Ratio (VSWR). Includes a compact tuning coil and a rolling contact. A Reentrant cap serves as a capacitive top hat. A spiral cut enhances the efficiency is this very short antenna. A tough insulating tube covers the antenna to serve as a radome protect the user from RF burns. The use of rolling contacts on a smooth inside diameter of the tuning coil greatly reduces the force to move the contactor as well as the acoustical noise generated when tuning. A controller drives a servo motor to position the contactor to the optimal position within the tuning coil and selects the impedance to connect between the unused end of the tuning coil and the feed point of the antenna to optimize VSWR.

An example wearable electronic device may include a bridge; a first rim; a second rim; a first temple, and a second temple, wherein the first temple includes a first printed circuit board on which a wireless communication circuit is disposed and a ground area is partially formed; a non-conductive area formed on a part of the ground area; a feeder wire having a first end electrically connected to the wireless communication circuit and a second end disposed adjacent to the ground area; a feeder point formed adjacent to the second end of the feeder wire and electrically connected to the feeder wire; and a first electronic component electrically connected to a part of the ground area, electrically connected to the feeder point, using a first conductive connection member, wherein the part of the ground area and at least a part of the first electronic component may be utilized as antennas.

An antenna structure includes a substrate, a grounding surface and an antenna module. The substrate includes a first surface and a second surface. The antenna module is disposed on the second surface and includes a feeding point, a micro strip, n radiators and n coupling elements. The micro strip extends along a first axial direction and includes a first end, a second end, a first segment and a second segment. A width of the first segment is smaller than a width of the second segment. The n radiators are staggeredly connected to two sides of the micro strip along the first axial direction. The widths of the n radiators from the first end to the second end along the first axial direction are increased first and then decreased. The n coupling elements are separated from the micro strip and the n radiators.

An antenna structure includes a substrate, a grounding surface and an antenna module. The substrate includes a first surface and a second surface. The antenna module is disposed on the second surface and includes a feeding point, a micro strip, n radiators and n coupling elements. The micro strip extends along a first axial direction and includes a first end, a second end, a first segment and a second segment. A width of the first segment is smaller than a width of the second segment. The n radiators are staggeredly connected to two sides of the micro strip along the first axial direction. The widths of the n radiators from the first end to the second end along the first axial direction are increased first and then decreased. The n coupling elements are separated from the micro strip and the n radiators.

An electronic device includes a side surface member, a wireless communication circuit, and a switch circuit. The side surface member includes a first conductive portion coupled to the wireless communication circuit and the switch circuit, a second conductive portion coupled to the switch circuit, and a first non-conductive portion disposed between the first conductive portion and the second conductive portion. The switch circuit is controlled to be in at least one of a first state, a second state, and a third state, based on a first frequency of a first operating signal supplied by the wireless communication circuit. The switch circuit is configured to couple the second conductive portion to the wireless communication circuit, in the first state, and to couple the second conductive portion to the first conductive portion, in the second state.

An antenna structure and a terminal device are provided. The antenna structure is applied to a terminal device with a curved screen. The antenna structure includes a radiator and a feeding point. The radiator has a first break and a second break located on different sides, the first break is on one curved side edge, and the second break is on one non-curved side edge. The feeding point is electrically connected to the radiator and located between the first break and the second break. A length of a radiation arm between the feeding point and the first break is less than a length of a radiation arm between the feeding point and the second break. The antenna structure has a low-frequency radiation mode that utilizes the radiation arm between the feeding point and the second break for radiation.

An antenna structure and a terminal device are provided. The antenna structure is applied to a terminal device with a curved screen. The antenna structure includes a radiator and a feeding point. The radiator has a first break and a second break located on different sides, the first break is on one curved side edge, and the second break is on one non-curved side edge. The feeding point is electrically connected to the radiator and located between the first break and the second break. A length of a radiation arm between the feeding point and the first break is less than a length of a radiation arm between the feeding point and the second break. The antenna structure has a low-frequency radiation mode that utilizes the radiation arm between the feeding point and the second break for radiation.

Antenna systems with tunable frequency response circuits are provided herein. In certain embodiments, an antenna system includes an antenna element and a tuning conductor that is spaced apart from the antenna element and operable to load the antenna element. Thus, the tuning conductor is electromagnetically coupled to the antenna element, for instance, capacitively coupled to the antenna element. Furthermore, a tunable frequency response circuit is electrically connected to the tuning conductor. By implementing the antenna system in this manner, antenna characteristics of the antenna element can be controlled.